Multilayer technique: the addition of the plastic film was the first step to produce brick containers impermeable to liquids and heat-sealable. Inside the sixties, an aluminum foil began to be additional towards the cardboard container to ensure better security and increase the shelf life of the packaged product or service. https://gabletopcartonsfordairy.blogspot.com/2025/06/hydration-with-purpose-sustainable.html